Island



NI E ST VILLIAM FIELD, OF PAVTUCKET, RHODE ISLAND.

MANNER 0F MANUFACTURING SCREW-AUGERS.

Specification of Letters Patent No. 1,553, dated April 15, 1840.

T 0 all whom t may concern.'

Be it known that I, WILLIAM FIELD, of Fawtucket, in the county of Providence and State of Rhode Island, have invented an Improvement in the Manner of Manufacturing Screw-Angers, which improvement consists in the use of swages or dies for giving the twist to the metal, by which means the process of twisting is facilitated and in consequence of the twist being given under the hammer the metal is consolidated and the article is rendered much superior to such as are twisted by hand or by the apparat-us heretofore employed for that purpose; and Ido hereby declare that the following is a full and exact description thereof.

In'the accompanying drawing Nos. 1 and 2 represent the two swages or dies employed by me. In Figure 1, they are placed upon each other, as when in use. In Fig. 2, an auger in part twisted is shown as placed in one of the dies, its fellow die No. 2 Fig. 8, being removed. Each of these dies'has a semicircular hollow or plate, A, A, extending from side to side, with the exception of that part within said semicircle by which the twist is to be given to the auger; the diameter of said hollow must of course correspond with that which is to be given to the auger'. In the middle of said semicircular plate, or hollow, there is, in each of the dies, a segment of a screw, or thread, making upward of half a turn and standing obliquely within it at an angle of about this thread is rounded so as to form nearly yhalf a circle, and to t the hollow of the swages, or dies maybe aflixed in any of thev ways known to workmen so as to cause them to come together with the requisite accuracy. These may be used with any kind of tilt or trip hammer, or by hand, as jumpers` In drawing out that part C, of the iron, which is to fo-rm the twist of the auger, it is left thicker at the middle than toward the edges. In giving the twist the metal is to be t-urned around by hand, and when it has been thus passed through the dies it will be accurately twisted, and perfectly uniform in all its parts. l

Having thus fully described the nature of my invention and the manner in which I carry the same into effect, what I claim as my invention and desire to secure by Letters Patent, is-- The forming the twist in screw angers by means of swages, or dies constructed and operating substantially as herein set forth. WILLIAM FIELD.

Vitnesses: l

JAMES HU'roHIsoN, BARNEY MONEY. 

